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The Gourdou-Leseurre GL-820 HY family of four-seat single-engined floatplanes were designed and built in France during the latter half of the 1930s by Gourdou-Leseurre. The GL-820 HY and GL-821 HY 02 were shipborne reconnaissance / observation aircraft, while the sole GL-821 HY was built as a torpedo carrier.

GL-820 HY
Role	Shipborne reconnaissance / torpedo floatplane Type of aircraft
National origin	France
Manufacturer	Gourdou-Leseurre
First flight	GL-820 HY 10 May 1935 GL-821 HY 28 January 1936 GL-821 HY 02 5 October 1937
Number built	1x GL-820 HY 1 x GL-821 HY 1 x GL-821 HY 02

Design and development

The Gl-820 and GL-821 were low-wing monoplane floatplanes with four tandem open cockpits, (the Cockpits on the GL-821 HY 02 were enclosed). The wings, tailplanes and floats were all supported by a system of streamlined struts.

Variants

GL-820 HY

The initial reconnaissance aircraft prototype, powered by a 730 hp (540 kW) Hispano-Suiza 9Vb driving a two-bladed fixed-pitch wooden propeller.[1]

GL-821 HY

The second aircraft built as a torpedo carrier, powered by a 750 hp (560 kW) Gnome & Rhône 9Kfr.[2]

GL-821 HY 02

The third aircraft, powered by a 750 hp (560 kW) Gnome & Rhône 9Kfr driving a three-bladed metal propeller.[3]

Specifications (GL-821 HY)

Data from Aviafrance : Gourdou Leseurre GL-821 HY,[2] Gourdou Leseurre GL-821 HY 02,[3] Gourdou Leseurre GL-820 HY[1]

General characteristics

• Crew: 4
• Length: 11 m (36 ft 1 in)
• Wingspan: 16 m (52 ft 6 in)
• Height: 5.2 m (17 ft 1 in)
• Wing area: 44 m² (470 sq ft)
• Empty weight: 1,950 kg (4,299 lb)
• Gross weight: 3,200 kg (7,055 lb)
• Powerplant: 1 × Gnome & Rhône 9Kfr 9-cylinder air-cooled radial piston engine, 560 kW (750 hp)
  

GL-820 HY: 1 x 730 hp (540 kW) Hispano-Suiza 9Vb 9-cylinder radial

Performance

• Maximum speed: 220 km/h (140 mph, 120 kn)
  

Gl-820 HY: 215 km/h (134 mph; 116 kn)

Gl-821 HY 02: 235 km/h (146 mph; 127 kn)

• Range: 1,000 km (620 mi, 540 nmi)
• Service ceiling: 7,000 m (23,000 ft)

Armament

• Guns: 1 × fixed forward firing 7.5 mm (0.295 in) Darne machine gun in the starboard wing; 2x 7.75 mm (0.305 in) Lewis guns on a flexible mount in the rearmost cockpit
• Bombs: 300 kg (660 lb) of bombs (GL-820 HY and GL-821 HY 02) or one torpedo (GL-821 HY)

References

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